45 days new to vaping and gone buy/try crazy. 45 different e-liquids from China and USA makers. Most steeped 2-4 weeks or more. (2) oddball similar Flavor issues - BWB Waffle and Hangsen Pancake. First, I love waffles and Pancakes with butter(marg.) and Maple syrup. though I rarely have time to fix them. EGO Pass-thru fully charged - New Smoktech Super Shorty 1.7ohm cartomizers for each BWB Waffle - Maple smell, (real)Butter Taste - To buttery for me. Added some Hangsen Blueberry and I like it just fine. Hangsen Pancake - OMG !!!!! Something is seriously WRONG!!!! Same smell as BWB - Mapley, but there ends every similarity. This was the Most painful thing to happen to me in years and I was down for a month in Jan. from collapsing at work. I filled the carto with Hangsen Pancake and let it sit for about 30 minutes while grabbing a shower,etc. I then tossed it on the Ego and proceeded to take a draw and see if it would need tweaking also. INSTANT FIREBALL down my throat and into my lungs!!! Horrible Pain ensued - then panic.......... Calming down I thought ok dry hit or bad carto. I should have known better. I've already experienced plenty of dry hits just learning to vape. A bad carto would dead short, blow a battery or be weak/open. Like a dummy I tested this 2 more times(short hits) once after dripping onto the coil area. Then I 1/2 filled a ce2 v4 and got the same painful experience. This Was like a real FIREBALL - NO FLAVOR - NO ODER - Just PURE HOT PAIN!!! My Lungs hurt until early this AM And I am still wonder what was in that bottle. I don't believe it was Nic as no taste/smell and no side effects of Nic poisoning. Obviously not straight Vg/PG as they don't produce those results and the color was dark. Any Ideas what Happened? Could it have been Flavor Concentrate and Boiled when heated? I hope people read about things like this and exercise caution when trying new things. P.S. Thanks go out to BWB! My T555 Exotic in a Kanger T2 helped sooth the burning lungs through this painful time.